Description Cuprous Sulfide, 98+%, 100g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis:Appearance (Color) Dark grayAppearance (Form) Crystalline powder and/or chunks Alkali Salts <1.00% Chloride (Cl) <0.01% Iron (Fe) <0.10% CAS: 22205-45-4 FORMULA: Cu2S